Effect of a community heart failure clinic on uptake of β blockers by patients with obstructive airways disease and heart failure

Objective: To determine the pattern of beta blocker prescribing over one year in a heart failure clinic with a structured approach towards initiation and dose titration and to give a real life perspective on beta blocker use, compliance, and target dose achievement. Methods: Data were retrospectively analysed on 513 consecutive patients regularly attending a community heart failure clinic over a year. Systolic dysfunction was determined from two dimensional echocardiography ( left ventricular ejection fraction <= 40%) and lung function was assessed by spirometry. All patients were considered for b blocker initiation and dose up titration. Results: Within one year 157 patients died. 143 patients started beta blockers resulting in 315 (88%) patients taking beta blockers at one year; 38% were taking the target dose. 124 had evidence of airways obstruction at baseline, 100 (81%) of whom were taking beta blockers at one year. Forced expiratory volume in one second (1.1 v 1.5 l, p< 0.01) and forced vital capacity (2.3 v 2.5 l/min, p = 0.2) were not reduced in patients with airways obstruction who received beta blockers. Daily doses of beta blockers at one year did not differ statistically between patients with obstructive and patients with non-obstructive spirometry results. 12 patients discontinued beta blockers and 14 required dose reduction due to side effects. Conclusion: The majority of patients with heart failure and obstructive airways disease can safely tolerate low dose initiation and gradual up titration of beta blockers.